Method and apparatus of transmitting data based on frequency hopping
A method of transmitting a signal based on multi-stream CPDMA may include: allocating a plurality of data symbols to each of a plurality of data streams based on a frequency hopping pattern; applying a DFT function and a M-times repetition function to the data symbol allocated to the each of the plurality of data streams; applying a spectral weighting vector to the each of the plurality of data streams applying the DFT function and the M-times repetition function; and generating the signal based on the multi-stream CPDMA by performing an IDFT function and a cyclic prefix adding procedure with respect to the plurality of data streams to which the spectral weighting vector is applied, in which the spectral weighting vector is a vector for determining a frequency band in which the each of the plurality of data streams is used.
1. A method of transmitting a signal based on multi-stream cycle period division multiple access (CPDMA), comprising:
distributing a plurality of data symbols including in a block to each of a plurality of data streams based on a frequency hopping pattern by a user equipment (UE), the block being a group of the data symbols transmitted on an overlapped time based on the plurality of data streams;
applying a discrete fourier transform (DFT) function and a M-times repetition function to the data symbol allocated to the each of the plurality of data streams by the UE;
applying a spectral weighting vector to the each of the plurality of data streams applying the DFT function and the M-times repetition function by the UE;
generating the signal based on the multi-stream CPDMA by performing an inverse discrete fourier transform (IDFT) function and a cyclic prefix adding procedure with respect to the plurality of data streams to which the spectral weighting vector is applied, by the UE; and
transmitting the generated signal by the UE,
wherein the signal has a band-limited feature on a frequency domain and a time-limited feature on a time domain based on the spectral weighting vector,
wherein the spectral weighting vector is a vector for determining a frequency band and time resource for each of the plurality of data streams,
wherein the spectral weighting vector is determined based on f (i,j) =Trunc(DFT(Trunc(IDFT(g (i,j) ),ε)),ε), where ε is a truncation threshold value,
wherein the g (i,j) is a weighting function for each frequency band applied to each of the plurality of data streams, and
wherein the Trunc is
[
Trunc
(
x
,
ε
)
]
1
=
{
x
1
,
x
1
≥
ε
0
,
x
1
<
ε
,
where x is a input variable for the Trunc and x1 is a output variable for the Trunc determined based on ε.
2. The method of claim 1 , wherein
the data symbol distributed to the each of the plurality of data streams is determined based on B (i,j) b (i) =b (i,j) ,
the B (i,j) is a block diagonal matrix in which a sub-block matrix is an identical matrix, and a position and a size of the sub-block are determined based on the frequency hopping pattern, and
the b (i) is the plurality of data symbols, and
the b (i,j) is the data symbol allocated to a j-th data stream among the plurality of data streams.
3. The method of claim 2 , wherein
the frequency hopping pattern has a relationship of u n (i) ·u n (i′) =0 with a frequency hopping pattern of another UE,
the u n (i) is the frequency hopping pattern, and
the u n (i′) is the frequency hopping pattern of the another UE.
4. The method of claim 3 , wherein
a signal based on the multi-stream CPDMA is d CP (i) [m] obtained by adding a cyclic prefix to
d
(
i
)
[
m
]
=
W
LM
H
(
∑
j
=
1
J
i
F
(
i
,
j
)
Ψ
M
W
L
b
(
i
,
j
)
[
m
]
)
,
the W LM H is the IDFT function, the F (i,j) =diag(f (i,j) ), the ψ M is the M-times repetition function, the W L is the DFT function, the b (i,j) is the data symbol allocated to the j-th data stream among the plurality of data streams.
5. A user equipment operating in a radio communication network and configured to transmit a signal based on multi-stream cycle period division multiple access (CPDMA), the user equipment comprising:
a radio frequency (RF) unit configured to transmit and receive a radio signal; and
a processor operatively connected with the RF unit and configured to:
distribute a plurality of data symbols including a block to each of a plurality of data streams based on a frequency hopping pattern by a user equipment (UE), the block being a group of the data symbols transmitted on an overlapped time based on the plurality of data streams,
apply a discrete fourier transform (DFT) function and a M-times repetition function to the data symbol allocated to the each of the plurality of data streams by the UE,
apply a spectral weighting vector to the each of the plurality of data streams applying the DFT function and the M-times repetition function by the UE, and
generate the signal based on the multi-stream CPDMA by performing an inverse discrete fourier transform (IDFT) function and a cyclic prefix adding procedure with respect to the plurality of data streams to which the spectral weighting vector is applied, by the UE, and
transmit the generated signal,
wherein the signal has a band-limited feature on a frequency domain and a time-limited feature on a time domain based on the spectral weighting vector,
wherein the spectral weighting vector is a vector for determining a frequency band and a time resource for each of the plurality of data streams,
wherein the spectral weighting vector is determined based on f (i,j) =Trunc(DFT(Trunc(IDFT(g (i,j) ),ε)),ε), where ε is a truncation threshold value,
wherein the g (i,j) is a weighting function for each frequency band applied to each of the plurality of data streams, and
wherein the Trunc is
[
Trunc
(
x
,
ε
)
]
1
=
{
x
1
,
x
1
≥
ε
0
,
x
1
<
ε
,
where x is a input variable for the Trunc and x1 is a output variable for the Trunc determined based on ε.
6. The user equipment of claim 5 , wherein
the data symbol distributed to the each of the plurality of data streams is determined based on B (i,j) b (i) =b (i,j) ,
the B (i,j) is a block diagonal matrix in which a sub-block matrix is an identical matrix, and a position and a size of the sub-block is determined based on the frequency hopping pattern,
the b (i) is the plurality of data symbols, and
the b (i,j) is a data symbol allocated to a j-th data stream among the plurality of data streams.
7. The user equipment of claim 6 , wherein
the frequency hopping pattern has a relationship of u n (i) ·u n (i′) =0 with a frequency hopping pattern of another UE,
the u n (i) is the frequency hopping pattern, and
the u n (i′) is the frequency hopping pattern of the another UE.
8. The user equipment of claim 7 , wherein
the signal based on the multi-stream CPDMA is d CP (i) [m] obtained by adding a cyclic prefix to
d
(
i
)
[
m
]
=
W
LM
H
(
∑
j
=
1
J
i
F
(
i
,
j
)
Ψ
M
W
L
b
(
i
,
j
)
[
m
]
)
,
the W LM H is the IDFT function, the ψ M , the F (i,j) =diag(f (i,j) ), the ψ M is the M-times repetition function, the W L is the DFT function, the b (i,j) is the data symbol allocated to the j-th data stream among the plurality of data streams.